Build Broken Greasemonkey Script for TeamCity

This is a simple script that turns the TeamCity overview page green if all is good
and a nice red if any builds are broken.

We have a nice big 57” LCD information radiator
with a Firefox open cycling through tabs
of analytics, build Screens, service status, Jira etc. This script makes it blatantly obvious when we have a good build
and when we have a broken build.